<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<form action="#" method="post">
			<p>
				电话号码:
				<input type="text" name="tel" required pattern="^1[358]\d{9}"/>
				*以13,15,18开头的11位数字
				<br />
				<input type="submit" value="提交" />
			</p>
			
		</form>
	</body>
</html>
